Board Thread:Pokémon Help/@comment-32815586-20170814035446/@comment-31398341-20170814144954

For adventure teams, you probably only need Fire, Water and Grass type pokemon and an Ice Beam TM. You will have an easy time beating all gyms and bosses for sure. Actually, you can even just play with Decidueye and Swampert in adventure mode.

As Ninjawarrior93   said, though, if you want to beat your friend, you probably need to do a PVP team.